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  Ultrafast electronic band gap control in an excitonic insulator

Mor, S., Herzog, M., Golež, D., Werner, P., Eckstein, M., Katayama, N., et al. (2017). Ultrafast electronic band gap control in an excitonic insulator. Physical Review Letters, 119(8): 086401. doi:10.1103/PhysRevLett.119.086401.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-84AD-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-8FD9-7
Genre: Journal Article

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PhysRevLett.119.086401.pdf (Publisher version), 533KB
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TNS_photoemission_PRL_ref2_SM.pdf (Supplementary material), 232KB
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https://arxiv.org/abs/1608.05586 (Preprint)
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 Creators:
Mor, Selene1, Author              
Herzog, Marc1, Author              
Golež, Denis2, Author
Werner, Philipp2, Author
Eckstein, Martin3, 4, Author              
Katayama, Naoyuki5, Author
Nohara, Minoru6, Author
Takagi, Hide7, 8, Author
Mizokawa, Takashi9, Author
Monney, Claude10, Author
Stähler, Julia1, Author              
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Dept. of Physics, Univ. of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              
3Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938296              
4Univ. of Hamburg-CFEL, 22761 Hamburg, Germany, ou_persistent22              
5Dept. of Physical Science and Engineering, Nagoya Univ., 464-8603 Nagoya, Japan, ou_persistent22              
6Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan, ou_persistent22              
7Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany, ou_persistent22              
8Dept. of Physics, Univ. of Tokyo, 113-8654 Tokyo, Japan, ou_persistent22              
9Dept. of Applied Physics, Waseda Univ., 169-8555 Tokyo, Japan, ou_persistent22              
10Dept. of Physics, Univ. of Zurich, 8057 Zurich, Switzerland, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons
 Abstract: Symmetry-broken states are characterized by an order parameter, which usually appears if a material is cooled below a critical temperature. These fragile states are typically destroyed by strong optical pulses on an ultrafast timescale. A nontrivial challenge is therefore the enhancement of an order parameter by optical excitations, as this implies a strengthening of long-range order in a perturbed system. Here, we investigate the non-equilibrium dynamics of the electronic structure of the layered semiconductor Ta2NiSe5 using time- and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of FC=0.2 mJ cmF−2, the direct band gap is transiently reduced, while it is enhanced above FC. An analysis based on Hartree-Fock calculations reveals that this intriguing effect can be explained by the exotic low-temperature ordered state of Ta2NiSe5, which hosts an exciton condensate whose order parameter is connected to the gap size. These results demonstrate the ability to manipulate condensates of bound electron-hole pairs with light, and due to the similarity to BCS theory, this approach might also be applicable to the case of superconductors.

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Language(s): eng - English
 Dates: 2017-02-102017-08-232017-08-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1608.05586
DOI: 10.1103/PhysRevLett.119.086401
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 119 (8) Sequence Number: 086401 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1